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# Thread: Why does the mileage of bike is less than a car?

1. ## Why does the mileage of bike is less than a car?

Dear Friends;

I have a bit of confusion and need help to make it clear.
One of my colleague stated that the mileage of his 1300CC car is around 14km/l as he drives at 60km/h. I am astonished that the mileage of an 110cc bike is around 50km/l. The difference of both vehicles is as 1300/110 = 11.8. So car is almost 12times more powerful than bike. If mileage of an 110cc bike is 50km/l than the mileage of a 1300cc car should be 50/11.8 = 4.2km/l but result is not the same. Can anyone make me clear for this point?

Sorry if this is a stupid question.

2. Because usually 1 CC is for 1 KG.
A 125CC bike will weigh over 100kg and you weigh 60-200kg. That puts load on the engine.
Second, most bikes are Carby. Most cars available now are EFI. Bikes are revved more due to being Single piston
Cars have more than 3.

Waiting for some experts to shed a light!

3. yes its a really stupid question. and stupid calculations too. a 1300cc can give 8km n a 1300cc can give 20+km depend upon engine type and technology, and big engine dose not mean it use more fuel, in few cases a 800cc drink more fuel then a 1800cc car totally depend upon engine types and technology.

4. lol...no need to give answer now ..

5. CORRECT ME IF M WRONG.. but the RpM of a bike engine are higher than any car engine. it take time for a bike to achieve its max output torgue. where as a car engine do it very sufficiently. which mean bike engine suffer more work load. experienced people says that a
400cc bike engine = 1000cc car engine millage (keeping the technology same for both engine).

6. Hahahaha

7. I think ur missing out the most important part cylinders.

8. A Bike can give an average of 50kmpl or 30kmpl and similarly a car can give an average as low as 4kmpl and as high as 30kmpl it does not always depend on CC but on technology and condition of engine..

9. Mairay pyaray bhai ap in bato ki tension mat lay
Aram say apni 1300cc gari ya 125cc bike chalaey aur chill maray
Na apnay damagh par zor day
Moral: Cars and bike engines have no comaprison

10. No offence but its ridiculous question.
These calculations have nothing to do with bikes and cars.
Car and bike, they both are ergonomically very different.
U cannot just compare them by taking weight or CC's as parameters.

11. yep not comparible,

my 1.6VW golf diesel in Pakistan used to return 20-22 km/lit - my Yam RX115 did approximately 28 km/lit, my Kawi 440 did approximately 25 km/lit too.

12. So by your calculation, if 70CC can drive at 80km/h than a 1300CC car can run at (1300/70)*80=1485km/h but IT CANNOT. A lot of things matter as all above said, its a stupid calculation. And no comparison between 2 wheeler and 4 wheeler.

13. @ poster : I don't know the answer, but the answer of it could be informative for many (waiting for experts to elaborate)

@ all : The ones who think it is a "stupid question" please do not even bother to come and just say "it's a stupid question" again & again , just to make the poster realize something which he already apologized for. If you don't have a logical answer, or even a theoretical one, please don't waste your calories to write just this "stupid question" phrase again n again.

14. Firstly your question is not stupid. It makes sense.
Your impression is that a car engine with almost 12 times the displacement of a motorcycle engine must be consuming 12 times more fuel than the motorcycle engine therefore the fuel consumption of the motorcycle should be 12 times more than that of the car........ right..... its a fairly logical question and by no means a stupid question.

So basically a 12 times smaller engine (in terms of displacement) must also consume 12 times less fuel. That is possible if all the factors which effect the fuel consumption are same for both the engines..... so logically speaking its the variables which are messing up with the motorcycle engine.

So the question is....... what are variables for fuel consumption. So my dear friend...... there are several and the non exhaustive list is as follows:

1. Engine Temperature.
2. Fuel system (Carbs vs Fuel Injection)
3. Engine RPM
4. Engine Technology
5. Weight
6. Gear Ratio
7. Aerodynamics

1. Engine Temperature:
Your 1300cc car with a 14kmpl mileage suggests you are talking about an XLi. It has a liquid cooled engine with modern thermostate which ensures the engine attains the optimum working temperature asap and ensures it remains with the optimum limit. Whereas the poor air cooled 110cc bike (sprinter I guess) cannot maintain optimum temperature which effects its fuel economy.

2. Fuel System:
One has a 80's technology carb while the other a modern EFI which can monitor the air fuel mixture for each cylinder individually. EFI controls emissions and also increase performance and mileage. How? Lets see.... petrol (C8H18) requires exactly 12.5 times more oxygen to completely burn and produce energy as shown in the equation below:
2C8H18 + 25O2 ~> 16CO2 + 18H2O
An EFI system ensures that all petrol entering the combustion chamber completely burns with the exact amount of oxygen required....whereas a carb contains jets that will push the gas into the combustion chambers. The amount of fuel that can flow through these jets depends completely on the amount of air that can be pulled into the carburetor venture. Carn needs tuning...which is usually not 100% correct therefore the mixture is either a bit lean or a bit rich..... its almost impossible to get perfect air fuel mixture with a carb...... with an EFI you can come really close.....thus better fuel consumption.

3. Engine RPM:
The higher the RPM...... the more fuel you burn. Car engines are usually operating at lesser RPM than motorcycle engines mainly because of the load on the smaller engine.

4. Engine Technology:
Zameen aasmaan ka farq hai. The car has variable valve timing..... over head cam and what not...... the motorcycle engine has ancient OHV engines which inherently is not as efficient as OHC engine you find in the car.

5. Weight:
In this department the 2 wheeler has an edge however as other variable effect the effiency of the bike soo much that it effects go unseen.

6. Gear Ratio:
While engine displacement have much to do with final mileage but how your vehicle uses that power is crucial to the end result. The basic system that converts engine revolutions into rolling tires is your transmission. Thanks to a series of gears, the work your engine does can be multiplied to be more efficient. Taller final drive gears allow the engine to turn relatively few times while still producing plenty of speed. In 5th gear the XLi comfortably cruises at 60km/hr at about 2,000rpm......whereas the motorcycle engine is operating at over 6,000rpm to attain similar speed. No wonder the car engine is more fuel efficient.

7. Aerodynamics
These daily commuters motorcyle designers never took aerodynamics into consideration when designing these motorcycles you see on Pakistani road...... fortunately Cars have a better aerodynamics thus have better fuel efficiency.

Im pretty sure there must be several other factors however these were the ones I can think of on top of my mind.

15. Originally Posted by aximaxim
Firstly your question is not stupid. It makes sense.
Your impression is that a car engine with almost 12 times the displacement of a motorcycle engine must be consuming 12 times more fuel than the motorcycle engine therefore the fuel consumption of the motorcycle should be 12 times more than that of the car........ right..... its a fairly logical question and by no means a stupid question.

So basically a 12 times smaller engine (in terms of displacement) must also consume 12 times less fuel. That is possible if all the factors which effect the fuel consumption are same for both the engines..... so logically speaking its the variables which are messing up with the motorcycle engine.

So the question is....... what are variables for fuel consumption. So my dear friend...... there are several and the non exhaustive list is as follows:

1. Engine Temperature.
2. Fuel system (Carbs vs Fuel Injection)
3. Engine RPM
4. Engine Technology
5. Weight
6. Gear Ratio
7. Aerodynamics

1. Engine Temperature:
Your 1300cc car with a 14kmpl mileage suggests you are talking about an XLi. It has a liquid cooled engine with modern thermostate which ensures the engine attains the optimum working temperature asap and ensures it remains with the optimum limit. Whereas the poor air cooled 110cc bike (sprinter I guess) cannot maintain optimum temperature which effects its fuel economy.

2. Fuel System:
One has a 80's technology carb while the other a modern EFI which can monitor the air fuel mixture for each cylinder individually. EFI controls emissions and also increase performance and mileage. How? Lets see.... petrol (C8H18) requires exactly 12.5 times more oxygen to completely burn and produce energy as shown in the equation below:
2C8H18 + 25O2 ~> 16CO2 + 18H2O
An EFI system ensures that all petrol entering the combustion chamber completely burns with the exact amount of oxygen required....whereas a carb contains jets that will push the gas into the combustion chambers. The amount of fuel that can flow through these jets depends completely on the amount of air that can be pulled into the carburetor venture. Carn needs tuning...which is usually not 100% correct therefore the mixture is either a bit lean or a bit rich..... its almost impossible to get perfect air fuel mixture with a carb...... with an EFI you can come really close.....thus better fuel consumption.

3. Engine RPM:
The higher the RPM...... the more fuel you burn. Car engines are usually operating at lesser RPM than motorcycle engines mainly because of the load on the smaller engine.

4. Engine Technology:
Zameen aasmaan ka farq hai. The car has variable valve timing..... over head cam and what not...... the motorcycle engine has ancient OHV engines which inherently is not as efficient as OHC engine you find in the car.

5. Weight:
In this department the 2 wheeler has an edge however as other variable effect the effiency of the bike soo much that it effects go unseen.

6. Gear Ratio:
While engine displacement have much to do with final mileage but how your vehicle uses that power is crucial to the end result. The basic system that converts engine revolutions into rolling tires is your transmission. Thanks to a series of gears, the work your engine does can be multiplied to be more efficient. Taller final drive gears allow the engine to turn relatively few times while still producing plenty of speed. In 5th gear the XLi comfortably cruises at 60km/hr at about 2,000rpm......whereas the motorcycle engine is operating at over 6,000rpm to attain similar speed. No wonder the car engine is more fuel efficient.

7. Aerodynamics
These daily commuters motorcyle designers never took aerodynamics into consideration when designing these motorcycles you see on Pakistani road...... fortunately Cars have a better aerodynamics thus have better fuel efficiency.

Im pretty sure there must be several other factors however these were the ones I can think of on top of my mind.

sach sach batana axi
tum teacher to nahi ho ?

16. Originally Posted by aximaxim
Firstly your question is not stupid. It makes sense.
Your impression is that a car engine with almost 12 times the displacement of a motorcycle engine must be consuming 12 times more fuel than the motorcycle engine therefore the fuel consumption of the motorcycle should be 12 times more than that of the car........ right..... its a fairly logical question and by no means a stupid question.

So basically a 12 times smaller engine (in terms of displacement) must also consume 12 times less fuel. That is possible if all the factors which effect the fuel consumption are same for both the engines..... so logically speaking its the variables which are messing up with the motorcycle engine.

So the question is....... what are variables for fuel consumption. So my dear friend...... there are several and the non exhaustive list is as follows:

1. Engine Temperature.
2. Fuel system (Carbs vs Fuel Injection)
3. Engine RPM
4. Engine Technology
5. Weight
6. Gear Ratio
7. Aerodynamics

1. Engine Temperature:
Your 1300cc car with a 14kmpl mileage suggests you are talking about an XLi. It has a liquid cooled engine with modern thermostate which ensures the engine attains the optimum working temperature asap and ensures it remains with the optimum limit. Whereas the poor air cooled 110cc bike (sprinter I guess) cannot maintain optimum temperature which effects its fuel economy.

2. Fuel System:
One has a 80's technology carb while the other a modern EFI which can monitor the air fuel mixture for each cylinder individually. EFI controls emissions and also increase performance and mileage. How? Lets see.... petrol (C8H18) requires exactly 12.5 times more oxygen to completely burn and produce energy as shown in the equation below:
2C8H18 + 25O2 ~> 16CO2 + 18H2O
An EFI system ensures that all petrol entering the combustion chamber completely burns with the exact amount of oxygen required....whereas a carb contains jets that will push the gas into the combustion chambers. The amount of fuel that can flow through these jets depends completely on the amount of air that can be pulled into the carburetor venture. Carn needs tuning...which is usually not 100% correct therefore the mixture is either a bit lean or a bit rich..... its almost impossible to get perfect air fuel mixture with a carb...... with an EFI you can come really close.....thus better fuel consumption.

3. Engine RPM:
The higher the RPM...... the more fuel you burn. Car engines are usually operating at lesser RPM than motorcycle engines mainly because of the load on the smaller engine.

4. Engine Technology:
Zameen aasmaan ka farq hai. The car has variable valve timing..... over head cam and what not...... the motorcycle engine has ancient OHV engines which inherently is not as efficient as OHC engine you find in the car.

5. Weight:
In this department the 2 wheeler has an edge however as other variable effect the effiency of the bike soo much that it effects go unseen.

6. Gear Ratio:
While engine displacement have much to do with final mileage but how your vehicle uses that power is crucial to the end result. The basic system that converts engine revolutions into rolling tires is your transmission. Thanks to a series of gears, the work your engine does can be multiplied to be more efficient. Taller final drive gears allow the engine to turn relatively few times while still producing plenty of speed. In 5th gear the XLi comfortably cruises at 60km/hr at about 2,000rpm......whereas the motorcycle engine is operating at over 6,000rpm to attain similar speed. No wonder the car engine is more fuel efficient.

7. Aerodynamics
These daily commuters motorcyle designers never took aerodynamics into consideration when designing these motorcycles you see on Pakistani road...... fortunately Cars have a better aerodynamics thus have better fuel efficiency.

Im pretty sure there must be several other factors however these were the ones I can think of on top of my mind.
Full marks, agreed.

The question is perfectly logical and as explained by the bro there are many things that go in favour of a car.

But if technologies are kept similar then a bike can also do better for eg. Suzuki inazuma 250 would give 30km/ltr with a 24.5bhp engine and its 183kg weight.

Its milage is not exact half of honda cg125(20-22.5kmpl) because it has better technology...

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17. I must say that none of the answer has actually nailed the question. Thing is, Fuel economy mostly depends on engine's state of tune...

EXAMPLE:
How many horses a CG churns out??? Around 12BHP at the crank.
How much horses a 1.3L car churns out??? A 1.3L KIA Classic returns an impressive 16-18km/l and is rated at 60BHP...
See? CC for CC car engine is actually "WEAKER" then the CG!!! Now we're getting somewhere to the conclusion, aren't we? Read on...
If 1.3L engine was as powerful as the CG's engine, then it would be making close to 125BHP. Keep in mind that I've overlooked the fact that CG is a single cylinder and KIA is a 4 cylinder just to keep things simple for those EINSTEINS who are calling you STUPID...
Simple thing is, MORE BHP = MORE FUEL CONSUMPTION.
Second thing goes to rpms... KIA churns out all its horsepower at roughly 4,500rpm whereas on a CG you've to rev up to 9,000rpms to squeeze out all those 12 horses.
MORE RPMS = MORE BHP = MORE FUEL CONSUMPTION.
Sure, CG makes roughly twice more BHP when it comes to BHP per CC's but its also works twice as hard to squeeze all the juice (BHP)...
Hope you understand... Really Interesting question BTW. Feel free to ask any question here... The ones who are calling you stupid doesn't know the answer themselves...

18. Originally Posted by aximaxim
Firstly your question is not stupid. It makes sense.
Your impression is that a car engine with almost 12 times the displacement of a motorcycle engine must be consuming 12 times more fuel than the motorcycle engine therefore the fuel consumption of the motorcycle should be 12 times more than that of the car........ right..... its a fairly logical question and by no means a stupid question.

So basically a 12 times smaller engine (in terms of displacement) must also consume 12 times less fuel. That is possible if all the factors which effect the fuel consumption are same for both the engines..... so logically speaking its the variables which are messing up with the motorcycle engine.

So the question is....... what are variables for fuel consumption. So my dear friend...... there are several and the non exhaustive list is as follows:

1. Engine Temperature.
2. Fuel system (Carbs vs Fuel Injection)
3. Engine RPM
4. Engine Technology
5. Weight
6. Gear Ratio
7. Aerodynamics

1. Engine Temperature:
Your 1300cc car with a 14kmpl mileage suggests you are talking about an XLi. It has a liquid cooled engine with modern thermostate which ensures the engine attains the optimum working temperature asap and ensures it remains with the optimum limit. Whereas the poor air cooled 110cc bike (sprinter I guess) cannot maintain optimum temperature which effects its fuel economy.

2. Fuel System:
One has a 80's technology carb while the other a modern EFI which can monitor the air fuel mixture for each cylinder individually. EFI controls emissions and also increase performance and mileage. How? Lets see.... petrol (C8H18) requires exactly 12.5 times more oxygen to completely burn and produce energy as shown in the equation below:
2C8H18 + 25O2 ~> 16CO2 + 18H2O
An EFI system ensures that all petrol entering the combustion chamber completely burns with the exact amount of oxygen required....whereas a carb contains jets that will push the gas into the combustion chambers. The amount of fuel that can flow through these jets depends completely on the amount of air that can be pulled into the carburetor venture. Carn needs tuning...which is usually not 100% correct therefore the mixture is either a bit lean or a bit rich..... its almost impossible to get perfect air fuel mixture with a carb...... with an EFI you can come really close.....thus better fuel consumption.

3. Engine RPM:
The higher the RPM...... the more fuel you burn. Car engines are usually operating at lesser RPM than motorcycle engines mainly because of the load on the smaller engine.

4. Engine Technology:
Zameen aasmaan ka farq hai. The car has variable valve timing..... over head cam and what not...... the motorcycle engine has ancient OHV engines which inherently is not as efficient as OHC engine you find in the car.

5. Weight:
In this department the 2 wheeler has an edge however as other variable effect the effiency of the bike soo much that it effects go unseen.

6. Gear Ratio:
While engine displacement have much to do with final mileage but how your vehicle uses that power is crucial to the end result. The basic system that converts engine revolutions into rolling tires is your transmission. Thanks to a series of gears, the work your engine does can be multiplied to be more efficient. Taller final drive gears allow the engine to turn relatively few times while still producing plenty of speed. In 5th gear the XLi comfortably cruises at 60km/hr at about 2,000rpm......whereas the motorcycle engine is operating at over 6,000rpm to attain similar speed. No wonder the car engine is more fuel efficient.

7. Aerodynamics
These daily commuters motorcyle designers never took aerodynamics into consideration when designing these motorcycles you see on Pakistani road...... fortunately Cars have a better aerodynamics thus have better fuel efficiency.

Im pretty sure there must be several other factors however these were the ones I can think of on top of my mind.

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19. Originally Posted by signode
Dear Friends;

I have a bit of confusion and need help to make it clear.
One of my colleague stated that the mileage of his 1300CC car is around 14km/l as he drives at 60km/h. I am astonished that the mileage of an 110cc bike is around 50km/l. The difference of both vehicles is as 1300/110 = 11.8. So car is almost 12times more powerful than bike. If mileage of an 110cc bike is 50km/l than the mileage of a 1300cc car should be 50/11.8 = 4.2km/l but result is not the same. Can anyone make me clear for this point?

Sorry if this is a stupid question.
thats a very interesting point you have raised buddy. and please dont pay any attention to the ones who think this is stupid. it is infact a very good question.

Kindly allow me to offer my two cents on the subject:

1. generally car engines are more efficient than bike engines. car technology is older than bike technology (commercial sale) and hence car tech has evolved much more than bike tech.

2. secondly, bikes are usually categorized in two different slots. either they are economy drive models which are sold so cheap/inexpensive that it is pointless for manufacturers to do to research for better and more fuel efficient engines OR they are made so expensive that the manufacturer is only interested in higher RPM/Torgue/HP/performance and is least interested in fuel efficiency.

then comes the actual tech differences:

if you look at our single cylinder thumper , you find that the engines, fuel delivery systems and similarly drive terrains are utilizing technologies that were first used in in cars in early 50s and 60s.

for example: electronic fuel injection systems, computer controlled ignition timing, variable valve timings and multiple valves for intake and exhaust. these systems are almost never available in our locally produced bikes.

now just imagine a commuter bike with following features and imagine what the fuel average would be like:

CCU electronic fuel injected 250cc 4-valve single cylinder bike with computer controlled dual timed ignition (two spark plugs) and variable valve timing. now just imagine what the fuel average would be like in such a bike. this particular bike (hypothetical) calculates and adjusts its ignition timing, air-fuel mixture ratio, different valve timing for different RPM levels, analyzes exhaust gases and spark is produced through 2 plugs instead of one to promote a better burn. I am sure you must be thinking pretty impressive mileage right?

well...thats only one part of the equation, are you considering the actual size of the head to accommodate 4-valves? have you considered the overall volume of the engine? can you accommodate such a large engine on a bike frame such as the one on a 70cc or 150cc even?

are you considering the cost implications? would you pay something like 200k for a bikes that does 100km/liter? how many of us can spare 200K or even 150K for a bike?

any industry (commercial) usually runs on the basis of "money makes the mare go". if the industry thinks that they can make money by introducing such a bike vs the cost to make such a bike (bike's cost plus research and development) they would happily jump right on it.

unfortunately, the dynamics of our market are as such that you get guys who want a daily use bike to go to office or you get guys that are insisting on converting they 70cc bikes into crotch rockets by taking everything off and putting in bigger engine heads and 125 carbs. OR you get guys that are more than happy in converting their 125cc into super bikes through over boring, bigger sprockets and free flow exhausts.

now can you convince these guys into buying a bike with super economy but no initial pick or acceleration? can you convince such guys who have removed their bike's silencers just so that they can enjoy the roar of the engine? lols!

Regards.

20. Originally Posted by faiz.aslam.121
Because usually 1 CC is for 1 KG.
A 125CC bike will weigh over 100kg and you weigh 60-200kg. That puts load on the engine.
Second, most bikes are Carby. Most cars available now are EFI. Bikes are revved more due to being Single piston
Cars have more than 3.

Waiting for some experts to shed a light!
Than why cd 70 is going strongly in pK it weighs ovver 88-90 kg and if a person weighs 70-100 kg if 2 person sit on it which means 80 plus 80 plus 90 = 250 how can a 78 cc bike takes 250 wight

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